Whenever I think coupes, my mind gets blocked out by the 335

hence, why I'm getting one lol
If I try ever so hard to block that image, I would definitely say S5 in a heartbeat, like you said the interior is amazing, those headlights look great and the S-line wheels....oh boy!
Since you aren't an Audi fan, perhaps Nismo 370? Not a fan of Nissan, but true coupe, and since you are considering the GTR I figured you aren't objective to looking into Nissan. Also, it's still sporty, lots you can do to it, and gets better MPG obviously than the GTR. If this argument sounds ridiculous then I have one other choice.
Just because I'm in college and have no reason to be talking about cars this expensive quite yet, I saw an SL63 AMG a while back. I was standing on a street corner in NYC and watched one fly by me. Yeah....I hate Benz as I am a huge BMW fan, but there is a small spot in my heart for that car. It's just beautiful.